Add the yogurt into a large bowl, along with the water, whisk together until well mixed, then add in the red onion, garlic, parsley, lemon juice and season with sea salt and a generous portion of black pepper, mix together until well mixed

Drain the cans of tuna into a fine sieve with a bowl underneath, gently flake the tuna, then add into the bowl with the yogurt mixture, mix together until well mixed

To assemble the wraps, add a generous portion of the tuna mixture into a flour tortilla, then top off with slices of tomato and some shredded iceberg lettuce, tightly roll the tortilla like you would a burrito, enjoy!